Malicious PDF — malware analysis report

Static analysis result for SHA-256 623920196fbacff2…

MALICIOUS

PDF

70.0 KB Created: 2021-04-07 01:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55950ed64f681e81431c39166fd893c9 SHA-1: 96780f184a846943dd57c783aea8545b9e315eed SHA-256: 623920196fbacff2cecf914110e3a51328beda8138e475197081605df4575fa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF SEO LINK FARM' containing 30 external PDF links. The document body, though heavily obfuscated, contains text related to 'cellular crosswords answers' and the authoring application 'wkhtmltopdf', suggesting a lure to external content. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely for phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/123?utm_term=cellular+crosswords+answers
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/7943107.pdf
    • https://dowabibagugodu.weebly.com/uploads/1/3/4/6/134697665/4532363.pdf
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fd68a5cf04e6.pdf
    • https://static.s123-cdn-static.com/uploads/4366336/normal_6001177e86eea.pdf
    • https://petabururumeje.weebly.com/uploads/1/3/4/9/134902787/joduxakisa.pdf
    • http://bitunowaluf.sportsontheweb.net/agile_testing_approach.pdf
    • http://lakowuwi.22web.org/bonding_and_molecular_structure_more_lewis_structures_worksheet_answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/973dcaed-60fe-4a0f-8f7f-a28e3209c371/watodovuvuj.pdf
    • https://uploads.strikinglycdn.com/files/d5b8785e-b14b-4d21-a696-a8a431c6d10a/what_is_a_tempest_in_shakespeare.pdf
    • https://uploads.strikinglycdn.com/files/0754c247-3015-438a-9700-5ee017226792/wutubebafunin.pdf
    • http://feneluveje.epizy.com/bahishti_zewar_book_in_urdu_free_download.pdf
    • https://uploads.strikinglycdn.com/files/eccc5270-d3ce-4f21-bb7b-efc57effa0d3/what_are_the_levels_of_comprehension.pdf
    • https://uploads.strikinglycdn.com/files/263fb03f-23e6-4e5f-b2ba-ca966c6e9712/dd_adventurers_league_discord.pdf
    • https://uploads.strikinglycdn.com/files/8f958330-e7d8-4976-8675-40215f7835c0/how_do_i_reset_my_honda_service_code.pdf
    • https://uploads.strikinglycdn.com/files/c0701aff-f672-403e-834f-340060b83781/11066651237.pdf
    • http://sopavame.onlinewebshop.net/3382057841.pdf
    • http://zedofaxuboz.onlinewebshop.net/dasesaretorujamedibefone.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d570.bin
ab36928795a1fd5e63cea9c00c7fa5d264cc6785eecf6f70767536700b515b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 4932 bytes
font_01_sfnt_off0000e650.bin
e3f15b917e9271878226d78db7ae17204ba89644604344da0104cc2578037435		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 10880 bytes

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